Re: Midrange Porpoising
The reason the boat is porpoising is balance. Once you get to the mid range speed the boat is apparently riding on the hull where the stern and bow weight is near equal. At this point any increase in upward bow pressure will rotate the nose up and then gravity will bring it back down.<br /><br />Based on your comments about a transom wedge, you must be running with the motor down at this speed and the dealer is trying to give you more negative trim. I hope that your dealer is helping you pay for the gas you use. More negative trim may keep the bow from coming up but it will be at a cost in fuel economy. The most efficient method for the prop is perpendicular to the surface of the water ( no negative trim and no positive trim). Keep in mind that the trim gauge is telling you the position of the motor in relationship to the boat, not the water.<br /><br />If you are thinking that the Smart Tabs are for "fixing problems only", and this porpoising is your problem, don't bother buying the Smart Tabs (and I make them). Although they will eliminate the porpoising, your expectations of our product are too little. <br /><br />The common thinking is that props, transom wedges, hydrofoils, and set back plates are the answer to boat performance issues. Notice that all of these devices are related to the motor. The motor is there to propel the boat, not fix boat balance and hull issues. Although these problems can be minimized or eliminated with these motor related items, they will do so at a cost to some other performance characteristic. In other words they are a compromise.<br /><br />Your boat porpoises because it is stern loaded like most other boats. You need to create some additional bow pressure at the "porpoising speed" to keep the bow down. <br /><br />Your choices are Hydrofoils, Transom Wedges, etc.<br /><br />Do some additional research before you make a decision. Go to our web site (
www.nauticusinc.com) and down load the booklet on "Boat Balance and Performance" at the bottom of the left side menu. Or call 800-233-0194. Also check other posts, and sites.<br /><br />John DeAgro<br /><br />Nauticus, Inc.
